package com.ran.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.ran.reggie.common.CustomException;
import com.ran.reggie.dto.SetmealDto;
import com.ran.reggie.entity.Setmeal;
import com.ran.reggie.entity.SetmealDish;
import com.ran.reggie.mapper.SetmealMapper;
import lombok.extern.slf4j.Slf4j;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
import java.util.stream.Collectors;


@Service
@Slf4j
public class SetmealServiceImpl extends ServiceImpl<SetmealMapper, Setmeal> implements SetmealService {

	@Autowired
	private SetMealDishService setMealDishService;

	/**
	 * 修改套餐
	 * 首先清空表数据，再新增新数据
	 * @param setmealDto
	 */
	@Transactional
	public void exitWithDish(SetmealDto setmealDto) {

		// 保存套餐的基本信息，操作setmeal，执行insert操作
		this.updateById(setmealDto);
		List<SetmealDish> setmealDishes = setmealDto.getSetmealDishes();
		LambdaQueryWrapper<SetmealDish> queryWrapper = new LambdaQueryWrapper<>();
		queryWrapper.eq(SetmealDish::getSetmealId, setmealDto.getId());
		List<SetmealDish> list = setMealDishService.list(queryWrapper);
		if(list!=null)setMealDishService.remove(queryWrapper);
		for (SetmealDish setmealDish : setmealDishes) {		    
			setmealDish.setSetmealId(setmealDto.getId());
			setMealDishService.save(setmealDish);
		}
	}

	/**
	 * 新增套餐，同时需要保存套餐和菜品的关联关系
	 * 
	 * @param setmealDto
	 */
	@Transactional
	public void saveWithDish(SetmealDto setmealDto) {

		// 保存套餐的基本信息，操作setmeal，执行insert操作
		this.save(setmealDto);
		List<SetmealDish> setmealDishes = setmealDto.getSetmealDishes();

		setmealDishes.stream().map((item) -> {
			item.setSetmealId(setmealDto.getId());
			return item;

		}).collect(Collectors.toList());

		// 保存套餐和菜品的关联信息，操作setmeal_dish,执行insert操作
		setMealDishService.saveBatch(setmealDishes);
	}

	/**
	 * 删除套餐，同时删除菜品和套餐的关联数据
	 * 
	 * @param ids
	 */
	@Transactional
	public void removeWithDish(List<Long> ids) {
		// select count(*) from setmeal where id in(1,2,3) and status = 1
		// 查询套餐状态，确定是否可以删除
		LambdaQueryWrapper<Setmeal> queryWrapper = new LambdaQueryWrapper<>();
		queryWrapper.in(Setmeal::getId, ids);
		queryWrapper.eq(Setmeal::getStatus, 1);

		int count = this.count(queryWrapper);
		if (count > 0) {
			// 如果不能删除，抛出一个业务异常
			throw new CustomException("套餐正在售卖中，不能删除");
		}

		// 如果可以删除，先删除套餐表中的数据
		this.removeByIds(ids);

		// 删除关系表中的数据
		// delete from setmeal dish where setmeal_id in (1,2,3)
		LambdaQueryWrapper<SetmealDish> lambdaQueryWrapper = new LambdaQueryWrapper<>();
		lambdaQueryWrapper.in(SetmealDish::getSetmealId, ids);

		setMealDishService.remove(lambdaQueryWrapper);
	}
}
